1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <title></title> 5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6 <style type="text/css"> 7 <!-- 8 body{ 9 margin:0px; 10 padding:0px; 11 } 12 body,td{ 13 font-size:9pt; 14 } 15 --> 16 </style> 17 <script type="text/javascript"> 18 <!-- 19 var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; 20 //将Ansi编码的字符串进行Base64编码 21 function encode64(input) { 22 var output = ""; 23 var chr1, chr2, chr3 = ""; 24 var enc1, enc2, enc3, enc4 = ""; 25 var i = 0; 26 do { 27 chr1 = input.charCodeAt(i++); 28 chr2 = input.charCodeAt(i++); 29 chr3 = input.charCodeAt(i++); 30 enc1 = chr1 >> 2; 31 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); 32 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); 33 enc4 = chr3 & 63; 34 if (isNaN(chr2)) { 35 enc3 = enc4 = 64; 36 } else if (isNaN(chr3)) { 37 enc4 = 64; 38 } 39 output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) 40 + keyStr.charAt(enc3) + keyStr.charAt(enc4); 41 chr1 = chr2 = chr3 = ""; 42 enc1 = enc2 = enc3 = enc4 = ""; 43 } while (i < input.length); 44 return output; 45 } 46 //将Base64编码字符串转换成Ansi编码的字符串 47 function decode64(input) { 48 var output = ""; 49 var chr1, chr2, chr3 = ""; 50 var enc1, enc2, enc3, enc4 = ""; 51 var i = 0; 52 if (input.length % 4 != 0) { 53 return ""; 54 } 55 var base64test = /[^A-Za-z0-9+/=]/g; 56 if (base64test.exec(input)) { 57 return ""; 58 } 59 do { 60 enc1 = keyStr.indexOf(input.charAt(i++)); 61 enc2 = keyStr.indexOf(input.charAt(i++)); 62 enc3 = keyStr.indexOf(input.charAt(i++)); 63 enc4 = keyStr.indexOf(input.charAt(i++)); 64 chr1 = (enc1 << 2) | (enc2 >> 4); 65 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); 66 chr3 = ((enc3 & 3) << 6) | enc4; 67 output = output + String.fromCharCode(chr1); 68 if (enc3 != 64) { 69 output += String.fromCharCode(chr2); 70 } 71 if (enc4 != 64) { 72 output += String.fromCharCode(chr3); 73 } 74 chr1 = chr2 = chr3 = ""; 75 enc1 = enc2 = enc3 = enc4 = ""; 76 } while (i < input.length); 77 return output; 78 } 79 function utf16to8(str) { 80 var out, i, len, c; 81 out = ""; 82 len = str.length; 83 for(i = 0; i < len; i++) { 84 c = str.charCodeAt(i); 85 if ((c >= 0x0001) && (c <= 0x007F)) { 86 out += str.charAt(i); 87 } else if (c > 0x07FF) { 88 out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F)); 89 out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F)); 90 out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); 91 } else { 92 out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F)); 93 out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); 94 } 95 } 96 return out; 97 } 98 function utf8to16(str) { 99 var out, i, len, c; 100 var char2, char3; 101 out = ""; 102 len = str.length; 103 i = 0; 104 while(i < len) { 105 c = str.charCodeAt(i++); 106 switch(c >> 4) { 107 case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: 108 // 0xxxxxxx 109 out += str.charAt(i-1); 110 break; 111 case 12: case 13: 112 // 110x xxxx 10xx xxxx 113 char2 = str.charCodeAt(i++); 114 out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F)); 115 break; 116 case 14: 117 // 1110 xxxx 10xx xxxx 10xx xxxx 118 char2 = str.charCodeAt(i++); 119 char3 = str.charCodeAt(i++); 120 out += String.fromCharCode(((c & 0x0F) << 12) | 121 ((char2 & 0x3F) << 6) | 122 ((char3 & 0x3F) << 0)); 123 break; 124 } 125 } 126 return out; 127 } 128 // 测试代码 开始 129 var de = encode64(utf16to8("你好世界")); 130 document.writeln(de+"<br>"); 131 var ee = utf8to16(decode64(de)) 132 document.writeln(ee); 133 // 测试代码 结束 134 //--> 135 </script> 136 </head> 137 <body> 138 </body> 139 </html>